Adjustable scaffold and derrick.



M.` BAILER. ADJUSTABLE soAPFoLD AND' DEBBIOK.

v APPLICATION FILED HAB. 3, 1908.

TH: Nomzlsl PETER: co., wAlHINaTuN, p. c.

M. BAILER. ADJUSTABLE SAFFOLD AND DERRIUK.

- v urmouxorx FILED 1mm, 190s. 4 ,002, Patented May 25, 1909.

2 SHEETS-BEEF! 2.

MARTIN BAILER, or cnIoAeo, ILLINOIS.

` kAID.TUfuLllJBLE SCAFFOLD AND DERRCK.

f 'No'. 923,002.

Specification of Letters Patent.

Patented May 25, 1909.

i 'Appliation sied March s, 190B. sei-iai No. 419,040.

yTo all whom 'it may concern.' f rBe it known that LIVIARTIN BAILER,citiyzen ofthe United States, residing at Chicago, in ythe county ofCook and State of Illinois,

` y' have invented certain new and useful Im- I provements in AdjustableScaffolds and Derricks, of which the following is a speci- 'fficationThis inventionis an adjustable scaffold o and derrick particularlyadapted for building f smoke-stacks, tanks and upright tubes of variouskinds, and is useful especially when n such structures are, made of ironrings or sections which are bolted to'each other. 5 y, The'object of theinvention is to provide an improved device of the kind having simple andefficient means for supporting the scaffold within the stack or otherstructure.

A derrick is mounted on the scaffold, whereo by the successive sectionsand other material may be hoisted, the hoisting rope passing l downythrough the stack and being operated l fby a hoisting engine or the likeon the ground.

`.The scaffold can be quickly raised from one B position to anotherasfthe stack or other structure is built up.

V V :The invention is illustrated in the accomn panying drawings, inwhichy Figure 1 is a vertical section of the inveno tion. Fig. 2 is atop plan view of the scaffold. Fig. 3 is a section on the line 3MB.

i ylTigQl is a Lplan of the braces for the scaffold.

Referring specifically to the drawings, Fig.

f1 shows the apparatus ready for use and set inside of'a section l of asmoke-stack being built. The scaffold has a center casting 2 having ears3 on the outer side to which six (more or less) legs 5 are pivoted bybolts 4. g These, legs or supports extend downwardly o and outwardly andare made of flat bar iron twisted at their lower ends and sharpened, asindicated at 11, so as to rest upon the rim or top of the lower stacksection 12, pressing against the inside of the stack section 1.

5 .These supports are held in extended position by means of wires 13connected at their lower ends thereto and having coiled springs 14 attheir upper ends, which are fastened to hooks 15 the threaded ends ofwhich extend 0 through the lower flange of an upper ring 16 lof angleiron, and held there by nuts 17. By adjustingfthe nuts thetension on thesprings may be varied as desired. The springs tend to extend thesupports' and cause the same to y press against the sides of the stack,whereby they yare prevented from slipping off the edge of the lowerstack section, and are also caused to automatically engage the samewhen'the scaffold is raised to the next section. The whole scaffold andderrick are supported by these legs 5.

At the` center is a pipe 18 the lower end of which is expanded into asocket in the casting 2 and the upper end of which is provided with ahorizontal ring flange v19. On this ring flange is bolted a ring plate20, and also the inner ends of radial angle bars 21 the outer ends ofwhich are bolted to the outer ring 16 above referred to. A ring 23 isfas` tened to or clamped around the pipe 18, near the lower end thereof,and extending between this ring and the horizontal bars 21 are braces 24which are conveniently made of T-iron and are secured by bolts 25. Thesebraces serve to maintain and support the scaffold, the scaffold boardsor flooring 38 being laid upon the bars 21. Blocks 26 are riveted orotherwise fastened to the ring 16, conveniently at the outer ends of thebars 21, and set screws 27 pass through these blocks and are adapted tobe screwed against the side of the stack section 1 to hold the scaffoldsteady and in place when in use. When the scaffold is to be raised theset screws are loosened.

The ring plate forms an upper bearing for the tubu ar derrick standard28, the foot of which is stepped loosely in a bearing socket in thecasting 2. The derrick standard can be turned in a full circle. Itcarries at its upper end the blocks 29, 30 and 31,

The top of the derrick standard overhangs so that all material forbuilding the stack may be hoisted on the outside thereof and receivedonto the scaffold platform. When the scaffold is in place the uppersection 37 of the stack can easily be riveted to the section 1, and whensaid upper section is completed the set screws 27 are loosened and thewhole device hoisted by any suitable means, as by a block and tacklehung on the upper rim of the section 37 or on timbers laid across thetop thereof. l/Vhen the legs 5 reach the top of the section 1 they willsnap out over the same and catch thereon, and the scaffold will be readyto build another section. In this manner the scaffold can be raised asfast as the stack or other structure is constructed.

I claim: Y

1. ln a scaffold, the combination of a eentral block or piece, a seriesof radial legs hinged thereto and arranged to swing out to engagementwith a stack or the like, an upright mounted on said block, a platformsupported by said upright at the to thereof, and braces between theupright an the outer parts of the platform.

2. The combination of a platform, means to support the same at variouspositions in a stack or the like, and a derrick mounted upon theplatform and having a hoisting rope extending down through the platform.

3. The combination of a platform, means to support the same in a stackor the like and a rotary derrick having a tubular stand l ard mounted onthe platform and a hoisting rope extending down through the standard andthe platform.

4. The combination of a central block or casting, legs connected theretoand arranged to engage the side of a stack or the like, a tubular uright on said casting, a platform supporte on said upright, and aderrick having a standard resting on said casting and extending upwardlythrough the upright and the platform.

, In testimony whereof l affix my signature, in presence of twowitnesses.

MARTIN BAILER.

Witnesses:

NELLIE FELTsKoG, H. G. BATCHELOR.

